<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .box {
      width: 200px;
      height: 200px;
      border: 3px solid #000;
      font-size: 30px;
      margin-top: 10px;
    }

    .pink {
      background-color: pink;
    }

    .big {
      width: 300px;
      height: 300px;
    }
  </style>
</head>

<body>
  <div id='app'>
    <div class="box" :class="{pink:true, big:true}">FindYou.</div>
    <div class="box" :class="['pink', 'big']">FindYou.</div>
  </div>
  <script src="../vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {},
      methods: {}
    })
  </script>
</body>

</html>